CONTINUOUS CASTING METHOD OF CLAD STEEL SLAB

摘要

PURPOSE:To produce a clad steel slab having high accuracy at a high yield by preheating a steel strip for cladding which moves continuously to an adequate temp. and supplying a molten steel for a base metal onto the surface thereof and cooling forcibly the steel strip for cladding upon lapse of prescribed time. CONSTITUTION:The steel strip 6 for cladding supplied from a payoff reel 7 is continuously moved by driving rolls 8 and is passed via straightening rolls 11 through a heating surface 12. The strip 6 is heated in said surface so that the surface temp. thereof is maintained within the range of the temp. lower by 200 deg.C than the solidus line temp. of the strip 6 from 300 deg.C. The molten steel 5 as the base metal in a ladle 1 is supplied via a tundish 2 from the molten steel discharge port 4 thereof onto the surface of the strip 6 preheated in the above- mentioned manner and is welded thereto. The fore cooling to the strip 6 by spray nozzles 16 is thereafter started upon lapse of the predetermined time determined from the thickness and temp. of the strip 6 from the time when the steel 5 is supplied. The clad steel slab 10 having the defectless welded boundary and excellent quality is thus stably and continuously obtd. at a high yield.